package com.yeyks.common.utils;

import cn.hutool.http.HttpUtil;
import cn.hutool.json.JSONUtil;
import com.google.common.collect.Maps;
import com.yeyks.common.utils.webutil.CityUtils;

import java.util.HashMap;

/*
通过经纬度计算距离的工具类
 */
public class LocationUtils {

    private static double EARTH_RADIUS = 6378.137;

    private static double rad(double d) {
        return d * Math.PI / 180.0;
    }

    /**
     * 通过经纬度获取距离(单位：米)
     *
     * @param lat1
     * @param lng1
     * @param lat2
     * @param lng2
     * @return 距离
     */
    public static Double getDistance(double lat1, double lng1, double lat2,
                                     double lng2) {
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double a = radLat1 - radLat2;
        double b = rad(lng1) - rad(lng2);
        double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
        s = s * EARTH_RADIUS;
        s = Math.round(s * 10000d) / 10000d;
        s = s * 1000;
        return s;
    }

    public static void main(String[] args) {
        double distance = getDistance(34.2675560000, 108.9534750000, 34.2464320000, 108.9534750000);
        System.out.println("距离" + distance / 1000 + "公里");
    }

    public static CityUtils fromBaiDu(String cityName){
        String httpUrl = "http://api.map.baidu.com/geocoder";
        HashMap<String, Object> paramMap = Maps.newHashMap();
        paramMap.put("address", "城市名称");
        paramMap.put("output", "json");
        paramMap.put("key", "37492c0ee6f924cb5e934fa08c6b1676");
        paramMap.put("city", cityName);
        String json = HttpUtil.get(httpUrl, paramMap);
        return JSONUtil.toBean(json, CityUtils.class);
    }

}